Bump tornado from 6.0.4 to 6.3.2 in /examples/research_projects/lxmert (

huggingface#23766)

Bumps [tornado](https://github.com/tornadoweb/tornado) from 6.0.4 to 6.3.2.
- [Changelog](https://github.com/tornadoweb/tornado/blob/master/docs/releases.rst)
- [Commits](tornadoweb/tornado@v6.0.4...v6.3.2)

---
updated-dependencies:
- dependency-name: tornado
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/research_projects/lxmert/requirements.txt

@@ -86,7 +86,7 @@ testpath==0.4.4
 tokenizers==0.8.1rc2
 torch==1.6.0
 torchvision==0.7.0
-tornado==6.0.4
+tornado==6.3.2
 tqdm==4.48.2
 traitlets
 git+https://github.com/huggingface/transformers.git